本文实例讲述了mysql实现多表关联统计的方法。分享给大家供大家参考,具体如下:
需求:
统计每本书打赏金额,不同时间的充值数据统计,消费统计,
设计四个表,book 书本表,orders 订单表 reward_log打赏表 consume_log 消费表 ,通过book_id与book表关联,
问题:
当关联超过两张表时导致统计时数据重复,只好用子查询查出来,子查询只能查一个字段,这里用CONCAT_WS函数将多个字段其拼接
实现:
查询代码如下
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SELECT
b.id,
b.book_name,
sum ( IF ( o.create_time > 0 && o.create_time < 9999999999, o.price, 0 ) ) today_pay_money,
sum ( IF ( o.create_time > 0 && o.create_time < 9999999999, 1, 0 ) ) today_pay_num,
sum ( IF ( o.create_time > 999 && o.create_time < 9999, o.price, 0 ) ) yesterday_pay_money,
sum ( IF ( o.create_time > 999 && o.create_time < 9999, 1, 0 ) ) yesterday_pay_num,
sum (o.price) total_pay_money,
sum ( IF ( o.create_time > 9999 && o.create_time < 99999, 1, 0 ) ) total_pay_num,
( SELECT SUM ( total_score ) FROM book_reward_log WHERE book_id = b.id ) total_score,
(
SELECT
CONCAT_WS(
',' ,
SUM ( IF ( create_time > 0 && create_time < 998, score, 0 ) ),
SUM ( IF ( create_time > 9999 && create_time < 99998, score, 0 ) ),
SUM ( IF ( create_time > 99999 && create_time < 999998, score, 0 ) )
)
FROM
book_consume_log
WHERE
book_id = b.id
) score
FROM
book_book b
LEFT JOIN book_orders o ON b.id = o.bid
GROUP BY
b.id
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查询结果
score 为三个消费数,以逗号隔开
性能分析
希望本文所述对大家MySQL数据库计有所帮助。
原文链接:https://blog.csdn.net/flysnownet/article/details/90067875